2128869 Forged Crank 340, 273 318? Losing my mind!

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ADHD426

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I am trying to figure out if a forged crank with casting number 2128869 is for a 340, 318, or 273. As far as I am aware they all look identical, please please correct me if there is a way to tell the difference. The problem I am having:

1. http://www.mopar1.us/casting.html list 2128869 casting number as a 68-72 Forged 340 Crank or a 67-75 318 Crank. I am assuming some of the early 318 cranks were also forged?

2. In Don Taylor's book "How to Rebuild a Small Block Mopar" He has the following chart for crank casting numbers. The only place the 2128869 number shows up is as a forged 273.

So is there anyway to determine if a Crank with casting number 2128869 is a forged 340 crank?
Cranks.jpg
 
far as know 273's had forged cranks and are interchangeable between 273 318 and 340, 360 is externaly balanced and has its own crank. should work fine if the crank is good.so the answer to your question is no, but will work in a 340.
 
mrm0par said:
far as know 273's had forged cranks and are interchangeable between 273 318 and 340, 360 is externaly balanced and has its own crank. should work fine if the crank is good.so the answer to your question is no, but will work in a 340.
Click to expand...


I know they are interchangable, the problem is when you go to balance them, a 273 crank will take a ton of mallory and $$ to get a 273 balanced with 340 pistons. Which is what I would like to try to avoid.
 
.............A 340 crank is lighter than a 273 crank...........on a 340 the front and rear throws have a 1 in hole drilled thru them...........kim.........
 
The 273 crank will also have a small pilot hole at the rear and will not accept converters after 68. The size of the hole is aproxamently 1.55" and the larger is 1.78"
 
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